Anh, V. T., Nhuan, T. V. and Song, Y. (2012) “Thermal maturity of Oligocene oil-source rocks in the Cuu Long basin Vietnam: An approach using the illitization of smectite”, Petrovietnam Journal, 60, pp. 8-15. Available at: http://www.pvj.com.vn/index.php/TCDK/article/view/964 (Accessed: 20January2026).